tailieunhanh - Báo cáo lâm nghiệp: "Carbon partitioning: fructose 2,6-bisphosphate content as an indicator of specific changes in carbohydrate metabolism in needles from class II spruce trees"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Carbon partitioning: fructose 2,6-bisphosphate content as an indicator of specific changes in carbohydrate metabolism in needles from class II spruce trees. | 819s Ann. Sci. For. 1989 46 suppl. 819s-823s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Carbon partitioning fructose 2 6-bisphosphate content as an indicator of specific changes in carbohydrate metabolism in needles from class II spruce trees w. Einig and R. Hampp Universităt Tubingen Biochemie der Pflanzen Auf der Morgenstelle 1 D-7400 Tubingen . Introduction It has been shown that very low doses of airborne pollutants ozone sulfite can significantly change source-sink relationships. These shifts in allocation or transportation out of leaves can occur prior to reductions in photosynthesis ozone McLaughlin and McConathy 1983 and can take place within minutes Minchin and Gould 1986 . In spite of intense research in this area there is however only little information available about metabolic acclimation of tissues to pollutants. It has thus been our aim to screen for biochemical indications of altered patterns of carbon allocation in needles of Norway spruce Picea abies . Materials and Methods The materials used for our investigations were needles from spruce trees from 2 locations in chloroplast Cell wall Photosynthesis Starch TP Cytoplasm Sucrose Fig. 1. Carbon partitioning between starch and sucrose. Intermediates and regulatory events a pyrophosphatedependent fructose 6-phosphate phosphotransferase PFP b fructose 1 6-bisphosphatase F16BP fructose 1 6-bisphosphate F26BP fructose 2 6-bisphosphate TP triose phosphates. 820s a Fig. 2. Content of starch a and sucrose b in Norway spruce needles in relation to needle age and vegetation period. the southern part of the Black Forest Kalbele-scheuer and Haldenhof near Freiburg . . Collection and freeze-drying of needle samples as well as metabolite analyses were as described elsewhere Einig and Hampp 1988 Hampp etal. 1989 . 821s Results and Discussion Season- and age-dependent variations in pool sizes There is considerable evidence that the rate of starch synthesis is controlled by the rates of .